I am very new with this.
Got two D-Link DPH-150S and a Digium Asterisk AA50.
From default I created two user extensions tried all sorts of configs. Same on the D-Link phones, but cannot call the other extension.
Tried “sip set debug” cannot see anything there.
Strangly when I activate the on the Digium the voicemail function and i call the extension I can hear the message “The person at extension xxxx is not availagle”